This chapter explains how to add and delete slave servers.
Hadoop splits the data to be processed among multiple slave servers and processes it in parallel, enabling large-scale data to be processed in a short period of time. Therefore, the performance of systems that use this product can be improved by increasing the number of slave servers for distributed processing.
The processing load per server can be balanced by increasing the number of slave servers to achieve even better performance.
If the scale of data processed by an application developed using Hadoop increases, and improved performance is required, add a slave server.
Point
After changing the configuration by adding or deleting a slave server, but before restarting operations, ensure that you back up the configuration information for master servers, development servers, and collaboration servers.
Refer to "14.1 Backup" for details.
